PROCESS FOR THE PRODUCTION OF ASYMMETRICAL PHOSPHORIC ACID DIESTERS

PROCEDE DE FABRICATION DE DIESTERS D'ACIDE PHOSPHORIQUE ASYMETRIQUES

English Abstract

The process is characterized in that a phosphoric acid
ester is condensed with a compound containing hydroxy
groups in the presence of an arylsulfonic acid chloride
and an organic base, the residue of evaporation is
stirred out with an organic solvent after the
hydrolysis, the arylsulfonic acid pyridine salt which
forms is nearly completely crystallized and recycled,
the lipid derivative that is formed is precipitated as a
sparingly soluble salt by addition of a solution
containing alkaline-earth ions and isolated, the
sparingly soluble salt is isolated as the free acid in
an organic solvent by suspension in a water-immiscible
organic solvent and a dilute aqueous mineral acid, the
crude product is purified if desired, by means of
preparative chromatography on a RP phase and
subsequently the free acid is converted if desired into
any desired salt.

French Abstract

L'invention a pour objet un procédé de fabrication de diesters d'acide phosphorique asymétriques. Ledit procédé est caractérisé par les étapes suivantes: condensation d'un ester d'acide phosphorique avec un composé renfermant des groupes hydroxyle en présence d'un chlorure d'arylacide sulfonique et d'une base organique; précipitation après hydrolyse du résidu d'évaporation avec un solvant organique, cristallisation quasi complète et recyclage, après hydrolyse, du sel de pyridine d'arylacide sulfonique, précipitation et isolation sous forme de sel difficilement soluble par addition d'une solution renfermant des ions alcalino-terreux, isolation du sel difficilement soluble par suspension dans un solvant organique non miscible à l'eau et dans un acide minéral, sous forme d'acide libre dans le solvant organique; le cas échéant purification du produit de base par chromatographie préparative en phase inverse puis transformation le cas échéant de l'acide libre en un sel quelconque.

Claims

-23-
Claims
1. Process for the production of asymmetrical
phosphoric acid diesters, wherein
[a] a phosphoric acid ester of formula I,
R1-O-P(O)(OH)2 (I)
in which R1 represents an organic residue, is
condensed with a compound II
R2 - OH (II)
in which R2 represents an organic residue,
in the presence of an arylsulfonic acid
chloride and an organic base,
(b) the phosphoric acid diester which is formed is
precipitated as a sparingly soluble salt by
the addition of a solution containing
alkaline-earth ions and it is isolated,
(c) the sparingly soluble salt is isolated as the
free acid in an organic solvent by
suspension in a water-immiscible organic
solvent and a dilute aqueous mineral acid.

-24-
2. Process as claimed in claim 1, wherein the crude
product obtained after steps [a] -[c] is purified
by preparative chromatography (step [d]) and if
desired the compound obtained as the free acid is
subsequently converted into any desired salt (step
[e])-
3. Process as claimed in claim 1 or 2, wherein the
solution containing alkaline-earth ions is a
solution containing calcium ions.
4= Process as claimed in any one of claims 1-3,
wherein benzene-, toluene-, 2,4,6-trimethyl-
benzene-, 2,6-dimethylbenzene-, 2,4,6-triisopropyl-
benzene- or 2,6-diisopropylbenzene-sulfonic acid
chloride is used as the arylsulfonic acid chloride.
5. Process as claimed in any one of claims 1-4,
wherein a phosphoric acid ester is used in which R1
denotes a lipid residue of the general formula IV
<IMG>
in which A and B can be the same or different and
denote hydrogen, C1-C18 alkyl, C1-C18 alkoxy, C1-C18
alkylthio, C1-C18 alkylsulfinyl or C1-C18
alkylsulfonyl
or in which R1 denotes a straight-chained or
branched, saturated or unsaturated alkyl chain with
10-20 carbon atoms which can be substituted if

-25-
desired once or several times by halogen C1-C6
alkoxy, C1-C6 alkylmercapto.
6. Process as claimed in any one of claims 1-5,
wherein a phosphoric acid ester is used in which R1
denotes a lipid residue of the general formula IV
in which A and B are different from one another and
denote C10-C16 alkoxy and C10-C16 alkylthio.
7. Process as claimed in any one of claims 1-6,
wherein a compound II is used in which R2
represents a 5'-nucleoside residue of the general
formula V
<IMG>
in which
R3 ~denotes hydrogen, halogen or a hydroxy
group,
R4, R5 each denote hydrogen or one of the residues
R4 and R5 denotes halogen, a hydroxy,
a cyano, an amino or an azido group and R3
and R4 in addition can represent a further
bond between C-2' and C-3',
R5' ~denotes hydrogen, hydroxy, azido, amino,

-26-
cyano or halogen
or it represents a seco-nucleoside residue
of the general formula V a
<IMG>
in which
R ~represents a hydrogen atom or a C1-C3 alkyl
group which is substituted if desired by
hydroxy, halogen or azido
and
denotes one of the following compounds:
<IMG>

-27-
in which
R6 ~can be hydrogen, an alkyl chain with
1-4 carbon atoms which can be
substituted by halogen, an alkenyl or
alkinyl residue with 2 - 6 carbon atoms
which can be substituted if desired by
halogen or it can be halogen
<IMG>
in which
R7 ~can be hydrogen, an alkyl chain with
1 - 4 carbon atoms which can be
substituted by halogen or it can be
halogen
<IMG>

-28-
in which
R8 ~can be hydrogen, an alkyl chain with
1 - 4 carbon atoms, halogen or a
hydroxy or amino group
<IMG>
in which
R9 ~can be hydrogen, halogen or an amino
group and
R10 ~denotes hydrogen, halogen, mercapto,
C1-C6 alkoxy, C1-C6 alkylmercapto or an
amino group which can be mono- or
disubstituted by C1-C6 alkyl, C1-C6
alkoxy, hydroxy, C2-C6 alkyl and/or
C3-C6 cycloalkyl, aryl, hetaryl,
aralkyl or hetarylalkyl groups
which can be further substituted if
desired in the aryl or hetaryl residue
by one or several hydroxy, methoxy or
alkyl groups or by halogen or it

-29-
denotes allyl which can be substituted
if desired by monoalkyl or dialkyl or
alkoxy groups.
8. Process as claimed in claim 7, wherein a compound
II is used in which R2 represents a 3'-deoxy-3'-
azidothymidine, 3'-deoxy-3'-fluorothymidine, 5-
fluorouridine, 6-mercaptopurine-9-.beta.-D-ribo-
furanoside, 6-methylmercaptopurine-9-.beta.-D-ribo-
furanoside, 9-{[(1-hydroxymethyl)ethoxy]-
methyl}guanine or 9-(ethoxymethyl)guanine residue.

Description

CA 02181474 2006-10-27
- 1 -
Process for the production of asymmetrical phosphoric
acid diesters
The present invention concerns a process for the
production of phosphoric acid diesters with two non-
identical organic residues.
The process according to the invention for the
production of phosphoric acid diesters is characterized
in that
[a] a phosphoric acid ester of formula I,
R1-O-P(O)(OH)2 (I)
in which R1 denotes a lipid residue of the
general formula IV
H2-A
H-B (IV)
CH2-
in which A and B can be the same or different and
denote hydrogen, C1-C18 alkyl, C1-C1$ alkoxy, C1-C18
alkylthio, Cl-C18 alkylsulfinyl or C1-C18 alkyl-
sulfonyl

2181474
=
- 2 -
or in which R1 denotes a straight-chained or
branched, saturated or unsaturated alkyl chain with
10-20 carbon atoms which can optionally be
substituted once or several times by halogen C1-C6
alkoxy, C1-C6 alkylmercapto
is condensed with an alcohol of formula II
R2 - OH (II)
in which R2 represents an organic residue,
in the presence of an aryl sulfonic acid chloride
and an otganic base,
(b) the phosphoric acid diester which is formed is
precipitated as a sparingly soluble salt by
the addition of a solution containing
alkaline-earth ions and it is isolated,
(c) the sparingly soluble salt is isolated as the
free acid in an organic solvent by
suspension in a water-immiscible organic
solvent and a dilute aqueous mineral acid.
The product that is formed is subsequently purified
further. This can for example be achieved by purifying
the crude product obtained after step [c] by preparative
chromatography on an appropriate column, for example a
reversed phase column (RP = reversed phase) (step [d])
and the compound obtained in the form of its free acid
is subsequently converted into any desired salt (step
[e] ) =
amended page

2181474
= - 3 -
In certain cases in ahich the alcohol of formula II has
for example further secondary OH groups in addition to a
primary OH group, it may be advantageous to react the
phosphoric acid ester of formula I with the aryl-
sulfonic acid chloride in the presence of an organic
base (producing the inixed anhydride) and only afterwards
add the alcohol of formula II.
The process claimed is particularly suitable for the
production of liponucleotides in which R2 represents a
nucleosidic residue.
Three different processes for the production of lipid
derivatives of nucleosides are shown in WO 92/03462:
1. Reaction of a lipid phosphate dichloride with the
nucleoside in the presence of an organic base.
2. Enzymatic catalysis of the reaction of a lipid
phosphoric acid monocholine ester with the
nucleoside (phospholipase D from Streptomyces).
3. Condensation of the lipid phosphate with the
nucleoside in the presence of DCC
(dicyclohexylcarbodiimide).
All three variants ai-e suitable for making inter-
nucleotidic bonds as well as for condensing nucleosides
with lipid phosphates and are described in the
literature.
The condensation of a lipid phosphate and of a
nucleoside using DCC is described in J. Med. Chem. 34,
amended page

2t8t474
=
- 3a -
1408 (1991), Biochem. Biophys. Res. Commun. 171, 451
(1990) and US 5,149,794. The enzymatically catalyzed
condensation of a phosphocholine with a nucleoside in
the presence of phospholipase D from Streptomyces is
described in Biochem. 31, 4757 (1992), EP 0 457 570,
EP 0 262 876 and WO 92/17487. In addition the use of
arylsulfonic acid chlorides for the synthesis of the
internucleotidic bonds has been propagated by Khorana et
al., in various publications [e.g. J. Am. Chem. Soc. 88,
829 (1966), dto. 86, 1630 (1964)] and especially the
sterically hindered 2,4,6-triisopropylbenzenesulfonic
acid chloride. This reagent was used by Hostetler et.al.
for the condensation of phospholipids with nucleosides
and is described inter alia in J. Biol. Chem. 265, 6112
(1990), dto. 266, 11714 (1991). Analogously it was
possible to condense nucleoside monophosphates with
primary lipid alcohols as described in J. Biol. Chem.
267, 20288 (1992)
Ca salts of glycerylphosphorylserines are described in
EP-A-0575717 and WO-A-9115494. These Ca salts of
carboxylic acids are readily soluble. A readily soluble
Ca salt of an asymmetric phosphoric acid diester is
described in WO-91-12256. The patent document DD-A-
138213 describes the conversion of phosphoric acid
diesters into a Ba salt.
However, the described methods have the disadvantage
that the production of lipid derivatives is only
possible in unsatisfactory yields. Further disadvantages
are in addition inadequate product purities and
complicated purification procedures which impede
mechanization on a large technical scale of for example
amounts of several kilograms. It was not even possible
amended page

2181474
=
- 4 -
to reproduce the published processes in the described
yields with larger process batches.
It was possible to eliminate these difficulties with the
process according to the invention. A further object of
the invention was to provide a process for purifying
surface-active phosphoric acid diesters. In addition the
end product of this process allows a direct comminution.
In particular the present invention concerns a process
for the production of lipid derivatives which is
characterized in that
[a] a phosphoric acid ester of formula I in which
R1 represents an organic residue, such as e.g.
a special lipid moiety, is condensed with a 5'
unprotected nucleoside in the presence of an
arylsulfonic acid chloride and an organic
base such as e.g. pyridine,
[b] after hydrolysis, the residue of evaporation
is stirred out with an organic solvent (e.g.
DIPE, MTB), the arylsulfonic acid pyridine
salt which is formed is almost completely
crystallized and recycled,
[c] the liponucleotide is precipitated as a
sparingly soluble salt by addition of e.g.
aqueous calcium acetate solution and isolated,
amended page

2181474
- 5 -
[d] the sparingly soluble salt is isolated as a
free acid in an organic solvent by suspension
in a water-immiscible organic solvent and a
dilute aqueous mineral acid (residue of
evaporation > 95 % area after HPLC).
The crude product is subsequently purified by
preparative chromatography on a RP phase and the free
acid is converted into any desired salt.
If desired an intermediate isolation is possible after
HPLCfrom the fractions containing product by
precipitation of the calcium salt and subsequent
conversion into the free acid and into the sodium salt
(as described above).
It is only this special combination of various process _-
steps which represents a decisive improvement that
enables the production of appropriate compounds in an
economic manner on a multi-kg scale.
The condensation in the presence of an arylsulfonic acid
chloride is also possible when using a nucleoside
monophosphate and a lipid alcohol in which case the
subsequent process steps are identical.
The lipid phosphate that is used can be added as a crude
product without having a significant influence on the
product purity or the yield relative to the nucleoside.

2181474
- 6 -
A suitable base is for-example pyridine or lutidine in
an inert organic solvent such as toluene or the reaction
is carried out directly in the base without a further
solvent. -
Benzene-, toluene-, 2,4,6-trimethylbenzene-, 2,6-
dimethylbenzene-, 2,4,6-triisopropylbenzene- or 2,6-
diisopropylbenzene-sulf'onic acid come into consideration
as arylsulfonic acid chlorides. The more bulky the
substituents in the ortho positions are, the less by-
products are to be expected.
In some cases a sterically hindered carboxylic acid
chloride or a phosphoric acid chloride can be used
instead of the arylsulfonic acid chloride.
Pivaloyl chloride is mentioned as an example of a
carboxylic acid chloride that can be used. A compound of
formula III which formally represents an anhydride of
the phosphate of formula I is also to be understood as
an active intermediate step for thecondensation with
the nucleoside when using a phosphoric acid chloride.
R1-O-P(O)(OH)-O-P-(O)(OH)-O-R1 (III).
Calcium in the form of its acetate, hydroxide, carbonate
or hydride is preferably used to precipitate the
sparingly soluble salt due to its good physiological-
compatability and the poor solubility of its salts in
organic solvents.
The chromatographic purification is preferably carried
out on a reversed phase using a methanol/buffer solution

2181474
- 7 -
as the eluant. In the final stage the isolated free acid
is converted into a physiologically tolerated salt e.g.
a potassium, lithium or sodium salt.-
Within the meaning of the present invention Rl is
preferably a lipid residue of the general formula IV
H2-A
H-B (IV)
CHZ-
in which A and B can be the same or different and denote
hydrogen, C1-C18 alkyl, C1-C18 alkoxy, C1-C18 alkylthio,
C1-Cls alkylsulfinyl or Cl-Clg alkylsulfonyl or R1 is a
straight-chained or branched, saturated or unsaturated
alkyl chain with 10-20 carbon atoms which can, if
desired, be substituted once or several times by
halogen, Cl-C6 alkoxy, C1-C6 alkylmercapto.
R2 preferably represents a 5' nucleoside residue of the
general formula V
-CH2 O B
R R3 (V)
51
R R
in which
R3 denotes hydrogen, halogen or a hydroxy group,

2181474
s
- 8 -
R4, R5 each denote hydrogen or one of the residues R4
and R5 denotes halogen, a hydroxy, a cyano, an
amino or an azido group and R3 and R4 in
addition can represent a further bond between
C-2' and C-3',
R5' denotes hydrogen, hydroxy, azido, amino, cyano
or halogen
or it represents a seco-nucleoside residue of
the general formula V a
- C~ 0 g
(V a)
R
in which
R represents a hydrogen atom or a C1-C3 alkyl
group which is substituted if desired by
hydroxy, halogen or azido
and
B denotes one of the following compounds:

2181474
~
- 9 -
l.)
0
=H R6
0N ' 'N
in which
R6 can be hydrogen, an alkyl chain with 1-4
carbon atoms which can be substituted by
halogen, an alkenyl or alkinyl residue with
2 - 6 carbon atoms which can be substituted
if desired by halogen or it can be halogen
2.)
NH2 7
N
ON
in which
R7 can be hydrogen, an alkyl chain with 1 - 4

2181474
~
- 10 - -
carbon atoms which can be substituted by
halogen or it can be.halogen
3.)
0
N N
Rf3~~N N
C
in which
R8 can be hydrogen, an alkyl chain with 1 4
carbon atoms, halogen or a hydroxy or amino
group
4.)
RTO
Ni N
R'N~ \\
in which
R9 can be hydrogen, halogen or an amino group
and
R10 denotes hydrogen, halogen, mercapto, C1-C6

~ 2181474
-~~-
alkoxy, C1-C6 alkylmercapto or an amino
group which can be mono- or disubstituted by
C1-C6 alkylõ C1-C6 alkoxy, hydroxy, C2-C6
alkyl and/or C3-C6 cycloalkyl, aryl,
hetaryl, aralkyl or hetarylalkyl groups
which can be further substituted if desired
in the aryl or hetaryl residue by one or
several hydroxy, methoxy or alkyl groups or
by halogen or it denotes allyl which can be
substituted if desired by monoalkyl or
dialkyl or alkoxy groups.
R2 preferably denotes a residue selected for example
from the group:
-2',3'-dideoxy-3'-azidouridine
-2',3'-dideoxyinosine
-2',3'-dideoxyguanosine
-2',3'-dideoxycytidine
-21,3'-dideoxyadenosine
-3'-deoxythymidine
-2',3'-dideoxy-2',3'-didehydro-N6-(0-methylbenzyl)-adenosine
-2',3'-dideoxy-2',3'-didehydro-N6-(2-methylpropyl)-adenosine
-2',3'-dideoxy-3'-azidoguanosine
-31-deoxy-3'-azidothymidine
-2',3'-dideoxy-3'-fluoro-5-chlorouridine
-2',3'-deoxy-3'-fluorcthymidine
-2',3'-dideoxy-3'-fluoroadenosine
-21,31-dideoxy-3'-fluoro-2,6-diaminopurine riboside
-2',3'-dideoxy-2',3'-dlidehydrocytidine
-3'-deoxy-2',3'-didehydrothymidine
-3'-deoxy-3'-azidothymidine
-5-fluorouridine
-5-trifluoromethyl-2'--deoxyuridine
-6-mercaptopurine-9-3-D-ribofuranoside

~ 2181474
12 -
-2-fluoroadenine-9-3-D-arabinofuranoside
-2-chloro-2'-deoxyadenosine
-Acylclovir
-Ganciclovir
Example 1
Production of the crude product of (3'-deoxy-3'-azido-
thymidine)-5'-nhosphoric acid-(3-dodecylthio-2-decyloxy)-
propyl ester
509 g (0.95 mol) 3-dodecylthio-2-decyloxy-propanol-l-
monophosphate are dissolved at room temperature in 2.84 1
dry pyridine. 443.8 g (1.467 mol) triisopropylbenzene-
sulfonic chloride is added to the solution, followed by
229 g (0.857 mol) AZT; it has all dissolved after stirring
for ca. 10 min at room temperature. The brown solution is
stirred overnight at room temperature. Then 1.43 1 water is
added and it is stirred for a further 30 minutes at room
temperature; the mixture becomes turbid on addition of water
but becomes clear agai!n when restirred. The solution is
concentrated by evaporation at ca. 60 C bath temperature in
a vacuum using a rotary evaporator and the evaporation
residue is twice redistilled with 2.8 1 toluene each time to
remove pyridine. 5.7 1 diisopropyl ether is poured over the
semi-solid evaporation residue and it is stirred for
ca. 1 hour in an ice bath. The salt is suction filtered
(pyridine salt of triisopropylbenzenesulfonic acid) and it
is rewashed in portions with 700 ml diisopropyl ether. The
salt is dried at 50 C (615 g) and stored or recycled. The
ether filtrate is shaken three times with 1.8 1 2n HC1 in
each case. If a good phase separation is not achieved, then
the emulsion layer is carefully suction filtered over a
Fibrazell layer. The organic phase is dried with sodium

2181474
=
13 -
sulfate and concentrated to a constant weight by
evaporation.
Measured weight 677 g crude phosphoric acid diester ("106
of theory in relation to AZT) HPLC: ca. 76 area %
(percentage area).
Example 2 Purification of the crude phosphoric acid diester by Ca salt
formation
283 g (0.38 mol) of the crude product from example 1 is
dissolved at room temperature in 1.73 1 methanol and 850 ml
water while stirring. A solution of 60.1 g Ca-acetate
hydrate in 400 ml water is added dropwise at room
temperature within ca. 45 minutes; a greasy precipitate is
firstly formed which is restirred for a longer period (e.g.
overnight). In this process the precipitate becomes powdery.
The calcium salt is suction filtered and, while wet from the
nutsch, it is intensively stirred out for ca. 30 minutes at
room temperature with 1 1 acetone. It is filtered by suction
and dried. Measured weight 192 g.
The calcium salt is suspended in 1.2 1 methyl-tert.butyl
ether and 276 ml 2n HC1 and stirred intensively until the
salt has disintegrated and a slightly turbid water phase has
formed. After separati_ng the phases, the MTB phase is washed
twice with 250 ml saturated NaCl solution each time, dried
over Na2SO4 and concentrated by evaporation.
Residue of evaporation: 179.1 g (63.2 % of the amount used)
HPLC 90.46 area %

~ 14 - 2181474
-
Example 3
Purification of the crude Uroduct by preparative HPLC
Preparative system:
stationary phase: Merck LiChroprep RP 18; 15-25
mobile phase: 0.02 molar NaH2PO4 solution 12.5 % +
methanol 87.5 %
125 g of the crude product from example 2 is dissolved in
750 ml methanol at ca. 35 C. 1.5 1 mobile phase is added and
it is adjusted to pH 5 with concentrated NaOH. The solution
is filtered and the filtrate is filled up to 2.5 1 with
mobile phase. This solution is chromatographed in portions
of 500 ml.
It is fractionated from the maximum of the main peak and a
fraction of 1.2 1 is cut. The combined pure fractions from 5
separations (6 1) are concentrated on a rotary evaporator at
40 C bath temperature in a vacuum to form a viscous residue.
The residue is rinsed in portions with a total of 500 ml
water from the apparatus and adjusted to pH 2 with semi-
concentrated HC1.
it is extracted with methyl-tert.butyl ether (1 x 2 1;
2 x 1 1); the phases separate almost cleanly and may be
slightly turbid. In the 3rd extraction both phases are
usually clear.
The combined MTB extracts are shaken twice with 250 ml
saturated NaCl solution each time in order to remove water.
The organic phase is dried over NaySOq4 and concentrated by
evaporation to a constant weight. Measured weight: ca. 70 g

2181474
- 15 -
HPLC: ca. 99.5 area $.
Example 4
Production of the Na salt
278.3 g (0.327 mol) of the HPLC-purified product from
example 3 is dissolved in 4.8 1 methanol at room
temperature; 760 ml water is added to the solution (it
becomes milky). It is adjusted against a calibrated
electrode to pH 5.8 with ln NaOH (ca. 300 ml) and the turbid
solution is sucked over a Seitz filter plate. The clear
filtrate is concentrated on a rotary evaporator in a vacuum.
The residue of evaporation is redistilled four times with
toluene. 5.8 1 acetone is poured over the dry residue of
evaporation and it is stirred for ca. 1 h at room
temperature. It is suction filtered, washed with a small
amount of acetone and iiried at ca. 50 C.
Yield: 278 g (97% of theory in relation to the purified free
acid) HPLC: 99.45 area=-$.
Example 5
Production of sodium salt by precipitation from a toluene
solution
3 g (0.0978 mol) purified free acid from example 3 is
dissolved in 500 ml toluene. The slightly turbid solution is
filtered over a Seitz filter. The required amount for the
salt formation (which is previously determined on an
aliquot) of a 30 % sodium methylate solution is added to the
toluene solution while stirring. The clear, slightly yellow

2181474
- 16 -
solution is slowly added dropwise to 3 1 acetone while
stirring. It is stirred further, overnight if necessary,
until the precipitate becomes powdery. The precipitate is
suction filtered; the nutsch may become sticky towards the
end of the suction. It is rinsed with a small amount of
acetone and the slightly sticky product is dried at 50 C.
Yield 66.2 g (88.1 % of theory).
Examnle 6
Production of (3'-deox)r-3'-azido-thymidinel-5'-Dhosnhoric
acid (3-dodecylthio-2-decyloxy)-propyl ester using benzene-
sulfonyl chloride
17.3 g (0.034 mol) 3-dodecylthio-2-decyloxy-propanol-l-mono-
phosphate is dissolved in 100 ml absolute pyridine
analogously to example 1, it is admixed with 6.5 ml
(0.051 mol) benzenesulfonyl chloride and stirred for a
further 4 hours at room temperature. 8 g (0.03 mol) AZT is
then added and it is processed further analogously to
example 1. The crude product (24.5 g; "109 %" of theory
relative to AZT) is converted analogously to examples 3 to 5
into the sodium salt. Yield 12.2 g (52.9 % of theory
relative to AZT) HPLC: 99.43 area $.
Example 7
Production of the Ca salt of (3'-deoxv-3'-azido-thymidine)-
51-nhosvhoric acid-(3-doflecylthio-2-decyloxy)prop9l ester
using 2.4,6-trimethvlbenzenesulfonyl chloride
86.8 g (0.17 mol) 3-dodecylthio-2-decyloxy-propanol-l-

2181474
- 17 -
monophosphate is allowed to react with 57.7 g(0.26 mol)
2,4,6-trimethylbenzenesulfonyl chloride in 515 ml absolute
pyridine analogously to example 6 and then reacted with
41.2 g (0.154 mol) AZT according to example 1. The crude
product obtained analogously to example 1 (138 g; "119" ~ of
theory relative to AZT) is converted into the crude Ca salt
analogously to example 2. Yield 98.2 g (83.2 % of theory
relative to AZT).
Example 8
Production of (3'-deoxy-3'-fluorothvmidine)-5'-ghosphoric
acid-(3-dodecylthig-2-decyloxy)propyl ester sodium salt
78.9 g (0.159 mol) 3-dodecylthio-2-decyloxypropanol-l-mono-
phosphate in 480 ml absolute pyridine is reacted with 35 g
(0.143 mol) 3'-deoxy-3'-fluorothymidine (FLT) in the
presence of 72.55 g (0.239 mol) 2,4,6-triisopropylbenzene-
sulfonyl chloride analogously to example 1. Measured weight
136 g crude product (130 % in relation to FLT). The crude
product is precipitated as a calcium salt analogously to
example 2, the precipitate is converted into the free acid
and purified by preparative column chromatography on a RP-18
analogously to example 3 and converted into the sodium salt
analogously to examples 4 + 5. Yield 74 g (69 % of theory
relative to FLT), HPLC: 99.41 area $.
Example 9
Production of (2 3'-dideoxy-inosine)-5'-phosphoric acid (3-
dodecvlthio-2-decylo&,0 ropyl ester sodium salt
15.8 g (32 mmol) 3-dodecylthio-2-decyloxy-propanol-l-mono-

~ 2181474
18
phosphate in 100 ml absolute pyridine is admixed with 14.5 g
(48 mmol) 2,4,6-triisopropylbenzenesulfonyl chloride
analogously to example 6 and after 4 hours it is reacted
with 6.77 g (29 mmol) 2',3'-dideoxyinosine (DDI). The crude
product is converted into the sodium salt analogously to
examples 3 to 5. Yield 13.04 g (61 % of theory relative to
DDI), HPLC: 99.4 area $.
Example 10
Production of (3'-deoxy,-3'-azidothymidine)-5'-phosphoric
acid-r2.3-bis(undecyloxy)lpropy1 ester sodium salt
15.8 g (32 mmol) 2,3 bis-(undecyloxy)propanol-l-mono-
phosphate is dissolved in 96 ml absolute pyridine
analogously to example 1 and reacted with 6.77 g (29 mmol)
31-azido-31-deoxythymidine (AZT) in the presence of 14.5 g
(48 mmol) 2,4,6-triisopropylbenzenesulfonyl chloride. The
crude product is converted into the sodium salt analogously
to examples 3 to 5. Yield 17.15 g (77 % of theory relative
to AZT), HPLC: 99.7 area $.
Example 11
The following compounds were prepared analogously to example
1 as a crude product, isolated by means of the calcium salt
analogously to example 2, purified by means of preparative
HPLC analogously to example 3 and converted into the sodium
salt analogously to example 5:
1. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
undecylmercapto-2-undecyloxy)propyl ester sodium
salt

2181474
- 19 - -
melting point 218-222 C decomp., Rf= 0.55 (mobile
solvent: isopropanol/butyl acetate/water = 5/3/2)
2. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
dodecyloxy-2-decyloxy)propyl ester sodium salt
melting point 205-211 C decomp., Rf= 0.60 (mobile
solvent: isopropanol/butyl acetate/water = 5/3/2)
3. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
decylmercapto-2-dodecyloxy)propyl ester sodium salt
melting point > 2060C decomp., Rf= 0.24 (mobile
solvent: MeOH/H20 = 8/2)
4. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
decylmercapto-2-decyloxy)propyl ester sodium salt ,
melting point > 207 C decomp., Rp= 0.45 (mobile
solvent: isopropanol/butyl acetate/water = 5/3/2)
5. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-
hexadecyl ester sodium salt
melting point 227-230 C decomp., Rf= 0.55 (mobile
solvent: isopropa!nol/butyl acetate/water = 5/3/2)
6. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
tetradecylmercapto-2-decyloxy)propyl ester sodium
salt
melting point 155 C, Rf= 0.30 (mobile solvent:
ethyl acetate/methanol = 3/1)

2181474
=
- 20 -
7. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
dodecylmercapto)propyl ester sodium salt
melting point > 200 C decomp., Rf= 0.20 (mobile
solvent: ethyl acetate/methanol = 3/1)
8. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
dodecylmercapto-2-dodecyloxy)propyl ester sodium
salt
melting point >170 C decomp., Rf= 0.25 (mobile
solvent: ethyl acetate/methanol = 3/1)
9. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
decylmercapto-2-hexadecyloxy)propyl ester sodium
salt
melting point 13511C, Rf= 0.35 (mobile solvent:
ethyl acetate/methanol = 3/1)
10. (3'-Deoxy-31-azidothymidine)-51-phosphoric acid-(2-
dodecyloxy)tetradecyl ester sodium salt
melting point 83 C, Rf= 0.35 (mobile solvent: ethyl
acetate/methanol = 3/1)
11. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
tridecylmercapto-2-decyloxy)propyl ester sodium
salt
melting point >190 C decomp., Rf= 0.20 (mobile
solvent: ethyl acetate/methanol = 3/1)
12. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
dodecylmercapto-2-octyloxy)propyl ester sodium salt
melting point >200 C decomp., Rf= 0.60 (mobile
solvent: methylene chloride/methanol/water =
65/25/4)*

~ 2181474
- 21 -
13. (3'-Deoxy-3'-azidothymidine)-5'-phosphoric acid-(3-
undecylmercapto-2-decyloxy)propyl ester sodium salt
melting point >200 C decomp., Rf= 0.25 (mobile
solvent: ethyl acetate/methanol = 3/1)
14. (3'-Deoxythymidine)-5'-phosphoric acid-(3-dodecyl-
mercapto-2-decyloxy)propyl ester sodium salt
melting point >175 C decomp., Rf= 0.45 (mobile
solvent: isopropariol/butyl acetate/water = 5/3/2)
15. Thymidine-5'-phosphoric acid-(3-dodecylmercapto-2-
decyloxy)propyl ester sodium salt
melting point 251--254 C decomp., Rf= 0.45 (mobile
solvent: n-propanol/H20 = 9/1)
16. (6-Mercaptopurine-9-B-D-ribofuranoside)-5'-
phosphoric acid-(3-dodecylmercapto-2-decyloxy)-
propyl ester sodium salt
melting point >200 C decomp., Rf= 0.45 (mobile
solvent: isopropanol/butyl acetate/conc.
ammonia/water = 50/30/5/15)
17. (5-Fluorouridine)-5'-phosphoric acid-(3-dodecyl-
mercapto-2-decyloxy)propyl ester sodium salt
melting point >210 C decomp., Rf= 0.55 (mobile
solvent: methylene chloride/methanol/water =
65/25/4)
18. (2',3'-Dideoxycytidine)-5'-phosphoric acid-(3-
dodecylmercapto-2-decyloxy)-propyl ester sodium
salt
melting point 202-205 C decomp., Rf= 0.50 (mobile
solvent: isopropanol/butyl acetate/water = 5/3/2)

i 2181474
- 22 -
19. (3-Deoxy-3'-fluorothymidine)-5'-phosphoric acid-(3-
undecylmercapto-2-undecyloxy)-propyl ester sodium
salt
melting point > 200 C decomp., Rf= 0.15 (mobile
solvent: CH2C12/MeOH = 8/2)
20. (6-Methylmercaptopurine-9-B-D-ribofuranoside)-5'-
phosphoric acid-(3-dodecylmercapto-2-decyloxy)-
propyl ester sodium salt
melting point > 170 C decomp., Rf= 0.22 (mobile
solvent: isopropanol/butyl acetate/water/conc.
ammonia 50/30/15/5)
21. 2'-(9-{[(1-Hydroxymethyl)ethoxy]methyl}guanine)-
phosphoric acid-(3--dodecylmercapto-2-decyloxy)-propyl
ester-sodium salt
Rf= 0.73 (mobile solvent: H20/MeOH 0.5/9.5 on RP-8),
Rf= 0.30 (mobile solvent: CH2C12/MeOH/H20 6.5/2.5/0.4
on silica gel)
22. 2'-[9-(Ethoxymethyl)guanine]-phosphoric acid-(3-
dodecylmercapto-2-decyloxy)propyl ester_sodium salt
Rf= 0.77 (mobile solvent: H20/MeOH 0.5/9.5 on RP-8),
Rf= 0.35 (CH2C12/MeOH/H20 6.5/2.5/0.4 on silica gel)